If you guys are trying to use the trainer in ONLINE MODE then that is why it is crashing or freezing. TRAINER IS DESIGNED FOR OFFLINE USE ONLY. The developers put new checks in place with this patch to combat people using cheats and hacks in online mode.

It's most likely not a hack, NewPortBeachGuy. Most probably it's either a bug in the game with it not registering, or just not becoming visible to other players (or a combination of both). That wouldn't suprise me considering how plagued with issues this series has been on the PC